You can buy these speakers now that have bi-amp ability, how exactly do you bi-amp speakers from a home audio receiver that only has 2 channels for the front left/right?

 

You can't.(And these speakers have been around for many years.)
You need a seperate amplifier for each set of binding posts. One amp feeds the mid/tweet and the other feeds the woofer (if that is how they are wired).
Or you can biwire the speakers (two sets of wires connected to the same amplifier output)- which is just a waste of time money and wire. But don't say that to some 'audiophiles' or they will spout more wire voodoo nonsence to back up their beliefs.

 

I don't know how many companies have this, but for my NAD integrated amplifier I can buy a second amplifier that is matched to the integrated in order to bi-amp my speakers.

 

with only 2 channels on the amp you can only biwire them. i've owned 7 pairs of speakers in the past year and all of them have that option. i'm currently bi-amping my martin logans.

 

Oooooooo...Logans. Very nice. May I ask what you're driving them with?

 

I know they have been around for years, I've known people who have had them for quite sometime but no one Bi-Amps them. So how with 2 receivers would you run bi-amp and insure there getting the same sound level to the tweeter and mid?

 

Run receiver #1's speaker outputs to the tweets. Run receiver #1's pre-outs into receiver #2's input.

Then everytime you adjust the volume on receiver #1 you must also adjustthe volume on receiver #2.

Alternativley you use one receiver (with pre-outs) and one amplifier.